B Measure the internal diameter of the bore in the piston

25.17 Do not over-compress the circlip when fitting it into the piston

26.3 Measuring piston ring installed end gap

2*46 Engine, clutch and transmission

26.5 Ring end gap can be enlarged by clamping a file in a vice and filing the ring ends can cause serious damage. The end gap can be increased by filing the ring ends very carefully with a fine file. When performing this operation, file only from the outside in (see illustration). 6Excess end gap is not critical unless it exceeds the service limit. Again, double-check to make sure you have the correct rings for your engine and check that the bore is not worn. 7 Repeat the procedure for each ring that will be installed in the cylinders. Remember to keep the rings, pistons and cylinder matched up. 8 Once the ring end gaps have been checked/corrected, the rings can be installed on the pistons. 9 The oil control ring (lowest on the piston) is installed first. It is composed of three separate components, namely the expander and the upper and lower side rails. Slip the expander into the groove, then install the upper side rail.

TOP RING Q SECOND (MIDDLE) RING C2 OIL RING Ш SPACER

20mm (0.8in) OR MORE

чпъы,

26.13 Stagger the ring end gaps as shown

26.9a Install the oil ring expander in its groove...

Do not use a piston ring installation tool on the oil ring side rails as they may be damaged. Instead, place one end of the side rail into the groove between the expander and the ring land. Hold it firmly in place and slide a finger around the piston while pushing the rail into the groove. Next, install the lower side rail in the same manner (see illustrations). Make sure the ends of the expander do not overlap.

10 After the three oil ring components have been installed, check to make sure that both the upper and lower side rails can be turned smoothly in the ring groove.

11 The upper surface of each compression ring should be marked at one end near the gap. Make sure that the identification mark or letter is facing up. Fit the middle ring into the middle groove in the piston. Do not expand the ring any more than is necessary to slide it into place. To avoid breaking the ring, use a piston ring installation tool.

20mm (0.8in) OR MORE

MARK

Дата добавления: 2015-10-29